 *{
            margin: 0;
            padding: 0;
        }
        html,body{
            width: 100%;
            height: 100%;
        }
        .header{
            width: 100%;
            height: 60px;
        }
        .header .logo{
            float: left;
            margin-left: 20px;
            opacity: 0.5;
        }
        .header .logo:hover{
            opacity: 1;
        }
        .header .logo a{
            display: inline-block;
            line-height: 60px;
            font-size: 20px;
            text-decoration: none;
            color: #ffffff;
        }
        .header .register{
            float: right;
            line-height: 60px;
        }
        .header .register li{
            list-style: none;
            float: left;
            margin-right: 30px;
            color: #fff;
            opacity: 0.5;
        }
        .header .register li:hover{
            opacity: 1;
        }
        .content{
            width: 100%;
            height: 500px;
        }
        .content .content_right{
            float: right;
            margin-right: 90px;
            width: 30%;
            height: 100%;
        }
        .content .content_left{
            width: 50%;
            height: 100%;
            float: left;
        }
        .content_left img{
            margin-left: 25px;
            height: 100%;
            width: 775px;
        }
        .div1{
            width: 440px;
            height: 350px;
            margin: 75px auto;
            background: white;
        }
        .nav1>li{
            list-style: none;
            width: 220px;
            height: 50px;
            background:#74ACCF;
            float: left;
            text-align: center;
            line-height: 50px;
            color: #ffffff;
        }
        .nav1>.l1{
            background: #cccccc;
        }
        .nav2>li{
            list-style: none;
            display: none;
        }
        .nav2>li>div{
            width: 500px;
            height:275px;
        }
        .nav2>.div1{
            display: block;
           /* margin-left: 20px;*/
        }
        .nav2 .input_username{
            margin-left: 20px;
            margin-top:30px;
            width: 40%;
            line-height: 30px;
            border-radius: 4px;
        }
        .nav2 .input_password{
            margin-left: 20px;
            margin-top:15px;
            width: 40%;
            line-height: 30px;
            border-radius: 4px;
        }
        .nav2 .input_submit{
            margin-left: 75px;
            margin-top:35px;
            width: 100px;
            height: 40px;
            background: #74ACCF;
            color: #ffffff;
            border-radius: 5px;
        }
        .nav2 .input_username1{
            margin-left: 20px;
            margin-top:30px;
            width: 40%;
            line-height: 30px;
            border-radius: 5px;
        }
        .nav2 .input_password1{
            margin-left: 20px;
            margin-top:15px;
            width: 40%;
            line-height: 30px;
            border-radius: 5px;
        }
        .nav2 .input_password2{
            margin-left: 20px;
            margin-top:15px;
            width: 40%;
            line-height: 30px;
            border-radius:5px;
        }
        .nav2 .input_submit1{
            margin-left: 75px;
            margin-top:35px;
            width: 100px;
            height: 40px;
            background: #74ACCF;
            color: #ffffff;
            border-radius: 5px;
        }
        .formtips{
            color: #ff0000;
        }
        .formtips1{
            color: #ff0000;
        }
        .formtips2{
            color: #ff0000;
        }
        .formtips3{
            color: #ff0000;
        }
        .formtips4{
            color: #ff0000;
        }
        .mask_bg{
            position: absolute;
            left: 0;
            top: 0;
            z-index: -2;
            width: 100%;
            height: 100%;
            background:url("../image/bg1.jpg");
            background-size: cover;
            filter: blur(100px);
        }
        .mask{
            position: absolute;
            left: 0;
            top: 0;
            z-index: -1;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.35);
        }